曝气池中气液两相流粒子图像测速技术

在粒子图像测速原理的基础上研究了基于快速傅立叶变换的粒子图像测速算法,并编制算法程序进行验证。通过试验研究了气液两相流在曝气池试验装置中的流动情况,应用粒子图像测速技术对装置中3种状态下气液两相流的运动参量进行测量,获得了各种流体运动参数,并应用粒子图像测速程序进行计算分析。试验结果表明当气液两相流处于状态3时,气泡在装置中具有最长的停留时间和较大的速度紊动强度,氧转移速率和效率大大提高,这为曝气池选型提供了依据。

PIV technology for study of gas-liquid two-phase flow in an aeration tank

A study was performed on the PIV algorithm based on fast Fourier transformation(FFT),and the PIV program was compiled and verified.The states of the gas-liquid two-phase flow in aeration tank experimental equipment were investigated.The fluid parameters of the gas-liquid two-phase flow in three different states were measured by use of PIV technology,and the measured data were analyzed with the PIV program.The result shows that,for the gas-liquid two-phase flow in state 3,the residence time of bubbles in the tank is the longest,the turbulent intensity is high,and thus,the oxygen transferring speed and efficiency are greatly improved.The study provided a basis for design of aeration tanks.